PHP Common Design Patterns Summary

Decoration Mode:

<?PHPAbstract classTile {Abstractfunction Getwealthfactor ();}classPlains extends Tile {Private$wealthfactor =2; function Getwealthfactor () {return$ This-Wealthfactor; }}Abstract classTiledecorator extends Tile {//Decoration  protected$tile; function __construct (Tile $tile) {$ This->tile =$tile; }}classDiamonddecorator extends Tiledecorator {//Diamond Decorationfunction Getwealthfactor () {return$ This->tile->getwealthfactor () +2; }}classPollutiondecorator extends Tiledecorator {//pollution Decorationfunction Getwealthfactor () {return$ This->tile->getwealthfactor ()-4; }} $tile=NewPlains ();p rint $tile->getwealthfactor ();//2$tile =NewDiamonddecorator (NewPlains ());p rint $tile->getwealthfactor ();//4$tile =NewPollutiondecorator (NewDiamonddecorator (NewPlains ())); Print $tile->getwealthfactor ();//0?>

Combination mode:

<?PHPAbstract classUnit {Abstractfunction Bombardstrength ();}classArcher extends Unit {function bombardstrength () {return 4; }}classLasercannonunit extends Unit {function bombardstrength () {return  -; }}classArmy {Private$units =Array (); Private$armies =Array (); function Addunit (Unit $unit) {Array_push ($ This-units, $unit); } function Addarmy (Army $army) {Array_push ($ This-armies, $army); } function Bombardstrength () {$ret=0; foreach( $ This->units as$unit) {$ret+ = $unitbombardstrength (); }    foreach( $ This->armies as$army) {$ret+ = $armybombardstrength (); }    return$ret; }} $unit 1=NewArcher (); $unit 2=Newlasercannonunit (); $army=NewArmy (); $army-Addunit ($unit 1); $army-Addunit ($unit 2);p rint $army-bombardstrength ();p rint"\ n"; $army 2= Clone $army;//Clone Army$armyAddarmy ($army 2);p rint $army-bombardstrength ();p rint"\ n";?>

Factory mode

<?PHP/** * Operation class * because it contains an abstract method, the class must be declared as an abstract class*/     Abstract classoperation{//abstract methods cannot contain function bodies         Abstract  Publicfunction GetValue ($num 1, $num 2);//It is strongly required that the subclass must implement the function function     }     /** * Addition class*/     classOperationadd extends Operation { Publicfunction GetValue ($num 1, $num 2) {return$num 1+$num 2; }     }     /** * Subtraction class*/     classOperationsub extends Operation { Publicfunction GetValue ($num 1, $num 2) {return$num 1-$num 2; }     }     /** * Multiplication class*/     classOperationmul extends Operation { Publicfunction GetValue ($num 1, $num 2) {return$num 1*$num 2; }     }     /** Division class*/     classOperationdiv extends Operation { Publicfunction GetValue ($num 1, $num 2) {Try {                 if($num 2==0){                     Throw NewException ("the divisor cannot be 0"); }Else {                     return$num 1/$num 2; }             }Catch(Exception $e) {echo"error message:". $eGetMessage (); }         }    /** factory class, mainly used to create objects * function: According to the input operation symbol, the factory can instantiate the appropriate object **/    classfactory{ Public Staticfunction Createobj ($operate) {Switch($operate) { Case '+':                    return NewOperationadd ();  Break;  Case '-':                    return Newoperationsub ();  Break;  Case '*':                    return Newoperationsub ();  Break;  Case '/':                    return NewOperationdiv ();  Break; } }} $test=factory::createobj ('/'); $result= $test->getvalue ( at,0); echo $result;?>

PHP Common Design Patterns Summary